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Novel Mutations of TCIRG1 Cause a Malignant and Mild Phenotype of Autosomal Recessive Osteopetrosis (ARO) in Four Chinese Families

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Novel Mutations of TCIRG1 Cause a Malignant and Mild Phenotype of Autosomal Recessive Osteopetrosis (ARO) in Four Chinese Families Acta Pharmacologica Sinica 2017: 1456–1465 © 2017 CPS and SIMM All rights reserved 1671-4083/17 www.nature.com/aps Original Article Novel mutations of TCIRG1 cause a malignant and mild phenotype of autosomal recessive osteopetrosis (ARO) in four Chinese families Xiao-ya ZHANG, Jin-wei HE, Wen-zhen FU, Chun WANG*, Zhen-lin ZHANG* Metabolic Bone Disease and Genetic Research Unit, Department of Osteoporosis and Bone Diseases, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, China Abstract Human autosomal recessive osteopetrosis (ARO), also known as infantile malignant osteopetrosis, is a rare genetic bone disorder that often causes death. Mutations in T-cell immune regulator 1 (TCIRG1) are a frequent cause of human ARO. Six additional genes (TNFSF11, TNFRSF11A, CLCN7, OSTM1, SNX10, PLEKHM1) were also found to be associated with human ARO. In order to expand the mutation spectrum and clinical diversity for a better understanding of the ARO phenotype and to further investigate the clinical characteristics of benign subjects with ARO, we here report five individuals with ARO from four unrelated Chinese families. X-ray examination was conducted and bone turnover markers were assayed. The gene of T-cell immune regulator 1 (TCIRG1) was screened and analyzed. Monocyte-induced osteoclasts were prepared and their resorption ability was studied in vitro. We identified five novel mutations (c.66delC, c.1020+1_1020+5dup, c.2181C>A, c.2236+6T>G, c.692delA) in these patients. Four patients displayed a malignant phenotype, three of them died, and one who received bone marrow transplantation survived. The remaining one, a 24-year- old male from a consanguineous family, was diagnosed based on radiological findings but presented no neurological or hematological defects. He was homozygous for c.2236+6T>G in intron 18; this mutation influenced the splicing process. Anin vitro functional study of this novel splicing defect showed no resorption pits on dentine slices. TCIRG1-dependent osteopetrosis with a mild clinical course was observed for the first time in Chinese population. The present findings add to the wide range of phenotypes of Chinese patients with TCIRG1-dependent ARO and enrich the database of TCIRG1 mutations. Keywords: autosomal recessive osteopetrosis; TCIRG1; malignant; mild phenotype; Chinese family Acta Pharmacologica Sinica (2017) 38: 1456–1465; doi: 10.1038/aps.2017.108; published online 17 Aug 2017 Introduction cavity and nerve compression. Li et al showed that the tar- Human autosomal recessive osteopetrosis (ARO) represents a geted disruption of Atp6i in mice resulted in severe osteo- group of inherited bone disorders characterized by diffusely petrosis[4]. Then, in 2000, Frattini et al elucidated for the first increased bone density due to the failure of bone resorption time that mutations in T-cell immune regulator 1 (TCIRG1) by osteoclasts[1]. ARO is a rare disease that has an incidence are a frequent cause of human ARO[5]. Subsequently, molecu- of 1 in 250 000 births[2], but the incidence is particularly high lar analysis has revealed that six additional genes (TNFSF11, in specific geographic regions (eg, Costa Rica, the Middle East, TNFRSF11A, CLCN7, OSTM1, SNX10, PLEKHM1) are associ- the Chuvash Republic of Russia and the Province of Västerbot- ated with human ARO. Mutations in TCIRG1 are responsible ten in northern Sweden). This distribution is attributed to the for more than 50% of ARO-affected individuals[6], demon- founder effect, geographic isolation or high parental consan- strating the crucial role of the V-ATPase in osteoclast func- guinity[3]. ARO renders bones more susceptible to hematologi- tion. Despite rapid development in the understanding of the cal impairment and secondary neurological deficit (blindness pathogenesis of osteopetrotic conditions, the genetic basis of or deafness), which are caused by a decreased bone marrow approximately 30% of cases remains to be elucidated[2]. Sobacchi et al and others have provided insight on a wide variety of TCIRG1 mutations, including missense, non- *To whom correspondence should be addressed. E-mail [email protected] (Zhen-lin ZHANG); sense, small deletions/insertions, splice-site mutations, large [5, 7-10] [email protected] (Chun WANG) genomic deletions and intronic mutations . However, Received 2017-01-19 Accepted 2017-05-11 data concerning Chinese TCIRG1-deficient ARO patients are www.chinaphar.com Zhang XY et al 1457 relatively limited, and include mainly reports of individual Materials and methods mutations[11, 12]. Here, we described a relatively large sample Subjects and samples of affected Chinese individuals with variable clinical severi- This study was approved by the Ethics Committee of the ties, and we focused on the identification of the molecular defect Shanghai Jiao Tong University Affiliated Sixth People’s Hospi- and osteoclast functional characterization of a 24-year-old male tal. The pedigrees of these families are shown in Figure 1, and who came from a consanguineous family. Moreover, the mild the major clinical findings are summarized in Table 1. phenotype of osteopetrosis was observed for the first time in Chinese population. To date, the only cure is hematopoietic stem Family 1 cell transplantation (HSCT), and we sincerely hope that more A 10-month-old proband (Pt 1, II1) (Figure 1A) was referred to patients are reported and further studies are performed. us for genetic diagnosis with clinical manifestations of ARO. Figure 1. (A) Pedigrees of the four Chinese families with TCIRG1-dependent ARO. Arrows indicate the probands. Filled black symbols refer to patients with ARO. Half-black symbols represent healthy carriers with a heterozygous mutation. (B) Location and sequencing of pathogenic TCIRG1 mutations. Family 1: c.1020+1_1020+5dup and c.66delc; Family 2: c.1213G>A and c.2181C>A; Family 3: c.292delA and c.909C>A; Family 4: c.2236+6T>G; (C). p.Tyr23ThrfsX4 (Y23), p.Lys231ArgfsX48 (K231), p.Gly405Arg (G405), p.Cys727X (C727) occur at a highly conserved position in TCIRG1, as shown by a comparison the corresponding sequence of 7 vertebrates. Acta Pharmacologica Sinica www.nature.com/aps 1458 Zhang XY et al Table 1. Laboratory data of TCIRG1-dependent patients. Pt 1 Pt 2A Pt 3 Pt 4 Ref range Age 9 months 53 d 7 months 24 years Calcium (mmol/L) - 2.05 1.36 2.60 2.08–2.60# Phosphorus (mmol/L) - 0.82 1.96 1.23 0.80–1.60# PTH (pg/mL) - - - 53.38 15.00–65.00 25(OH)D (ng/mL) - - - 22.98 11.11–34.43* ALP (U/L) - 767 - 71 15–112# LDH (U/L) - 829 1927 213 150–360 β-CTX (ng/L) - - - 707 100–612* OC (ng/mL) - - - 31.25 5.58–28.62* WBC (×109/L) 24 23.65 13.1 4.0 3.7–10 RBC (×1012/L) 2.8 3.23 3.45 5.19 3.68–5.74 PLT (×109/L) 47 35 126 112 90–320 HGB (g/L) 71 104 91 150 113–172 PTH, parathyroid hormone. * reference values were calculated from our previous study. # reference range for adults; pediatric reference values of calcium, phosphorus, ALP for 1–3 years old were 2.13–2.70, 1.4–2.3, 58–400 respectively. - data not available. He was the only child of unrelated parents and was born at chondral junctions at the ends of the ribs and a widened growth full-term via caesarean section. His tooth did not erupt when plate. Further inspection confirmed osteopetrosis (Figure 2A). he was referred to us, and he was smaller than his contempo- Blood tests indicated decreased serum calcium and phospho- raries. His height was 62 cm (normal range: 71.0–76.3 cm) and rus. Ultrasonography revealed that his liver was 24 cm below weight was 7.0 kg (normal range: 8.6–10.6 kg). At approxi- his right costae. Pathological features, such as overall growth mately 9 months old, he suffered from acute infection with retardation, delayed tooth eruption, tooth loss, poor vision and high fever, and routine blood tests showed clearly elevated recurrent infections, became evident, and finally he died of leucocytes and decreased red cells, platelets and hemoglobin. multiple organ failure at 4 years old. His height was 92.0 cm Abdominal ultrasonography detected an enlarged spleen (normal range: 98.7–107.2 cm) and weight was 12.2 kg (normal and liver. His liver margin was 4.0 cm below the right costae range: 14.8–18.7 kg). The patient had only four teeth at the time and the spleen margin was 6 cm below the left costae. Chest of death. Pt 2B, who was two years younger than Pt 2A, experi- radiography confirmed generalized osteopetrosis, with a wid- enced a normal childbirth. At approximately one month old, his ened growth plate widened and nodular rib ends. Magnetic anxious parents took him to the hospital for physical examina- resonance imaging (MRI) showed hydrocephalus as well as tion. Radiographs revealed elevated bone mineral density. He a downward displacement of the cerebellum. After carefully suffered from growth retardation [height 75 cm (normal range: evaluating the potential risks, surgeons successfully treated 84.3–91.0 cm) and decreased weight 10.5 kg (normal range: 11.2– the patient with a ventriculo-peritoneal shunt for hydrocepha- 14.0 kg) at two years old], anemia, and recurrent infections. His lus. The patient received bone marrow transplantation (BMT) first tooth erupted at approximately one year old. He could from two HLA-antigen mismatched related donors at approxi- not walk. He died of bone marrow failure at 2 years old. mately 13 months old. A combination of fludarabine, busulfan and cyclophosphamide was used as the conditioning regimen; Family 3 he received approximately 29.9×108/kg mononuclear cells and Patient 3 (Pt 3, II1, Figure 1A), a male, died of bone marrow 10.9×106/kg CD34+ cells.
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